[Rich]

If you're in standard tuning you can't use anything more than 10's, the springs can't handle them.

 

[Rich]

No, EGEN springs won't hold 13's, no springs Ibanez has will.

 

[Rich]

It'll handle the 10-58 at regular tuning, anything higher and you'll be detuning. The Egen springs are a little tighter than your 7 string springs but not by much.

 

[Rich]

Those are EGEN18 springs, only model they were ever used on. No springs will hold 13's at pitch on any ZR or EZ system.

If you're holding 13's at pitch on a TRS then you either have more that 3 springs or have high tension springs.

 

[Rich]

you might get away with 11's flat with Egen springs but they're not that much stronger than your stock springs.